如何清空所有的commit记录?

git checkout --orphan  new_branch

git add -A

git commit -am "commit message"

git branch -D master

git branch -m master

git push -f origin master

// Create a new orphan branch, named <new_branch>, started from
// <start_point> and switch to it. The first commit made on this new
// branch will have no parents and it will be the root of a new
// history totally disconnected from all the other branches and
// commits.
// 中文翻译：
// 创建一个独立的new_branch分支，HEAD指向当前分支，并自动切换到该分支；
// 分支没有父级结点，它是一个新的根记录，不与其他任何分支和提交记录有连接。

// The index and the working tree are adjusted as if you had
// previously run "git checkout <start_point>". This allows you to
// start a new history that records a set of paths similar to
// <start_point> by easily running "git commit -a" to make the root
// commit.
// 中文翻译：
// 它会基于你之前执行"git checkout <start_point>"的 start_point 分支，调整新的索引和分支树
// 你可以通过"git commit -a"提交一个新commit记录作为根提交记录，这样的话你就有个一个新的历史记录，
// 类似于 start_point 分支的一系列提交记录痕迹；

// This can be useful when you want to publish the tree from a commit
// without exposing its full history. You might want to do this to
// publish an open source branch of a project whose current tree is
// "clean", but whose full history contains proprietary or otherwise
// encumbered bits of code.
// 中文翻译：
// 如果你想把你的分支树变成只有一个commit记录，不想暴露他所有提交历史，那么它就很有用。
// 如果你想通过这样做发布一个开源分支工程，当前所有包含专利记录分支树就会被清空，否则就是一堆冗余的代码；

// If you want to start a disconnected history that records a set of
// paths that is totally different from the one of <start_point>, then
// you should clear the index and the working tree right after
// creating the orphan branch by running "git rm -rf ." from the top
// level of the working tree. Afterwards you will be ready to prepare
// your new files, repopulating the working tree, by copying them from
// elsewhere, extracting a tarball, etc.
// 中文翻译：
// 如果你想开始一个全新的提交记录，完全与start_point分支不同，在你创建这个独立分支后，
// 通过 'git rm -rf',从根工作空间删除所有工作空间和索引里面的文件。
// 随后，你可以通过从别处复制准备你的新文件来从新填充你的工作空间。